Gunmen in Lebanon have shot dead a prominent supporter of Syrian president Bashar al-Assad.

Mohammad Darra Jamo was a commentator for Syrian state media who often appeared on Arab TV channels to promote Mr Assad's cause.

He was killed by gunmen at his home in the Shiite Muslim town of Sarafand, in southern Lebanon, where he had lived for 20 years with his Lebanese wife.

It is the first assassination of a pro-Assad figure in Lebanon since the Syrian revolt began 28 months ago, and follows several attacks in recent weeks against the Lebanese Shiite Hezbollah group, which is now fighting for Mr Assad in Syria.

Lebanon is struggling to stay on the sidelines of the conflict in neighbouring Syria, but car bombs and clashes between groups supporting rival sides in Syria have become increasingly common.

Syrian state media blamed an "armed terrorist group" for the killing, and the Syrian Information Ministry called it a "heinous crime".

Lebanese security sources said supporters of Syrian rebels were top suspects in the killing in an area where Hezbollah's security control is normally tight.

Jamo's wife, who was with him when he was shot but was not hurt, said on Hezbollah's al-Manar television channel that officials from Syria's ruling Baath party had called her husband on Tuesday and warned him to be careful.

The same day a Hezbollah security official was killed and two were wounded when a convoy of vehicles heading to Syria from Lebanon was ambushed with a bomb and gunfire.

Kurds fight Al Qaeda allies on Turkish border

Near the Syrian-Turkish border, Kurdish armed men took control of most the town of Ras al-Ain from Islamist rebels of the Al Qaeda-linked Nusra Front, a monitoring group said.

The Syrian Observatory for Human Rights, an anti-Assad group, reported fierce clashes only about 200 metres from the Turkish border.

A Turkish man and a 15-year-old boy were killed in the Turkish border town of Ceylanpinar by stray bullets from the fighting, Turkish security sources and health officials said.

The Turkish army said troops later returned fire.

The latest clashes between Kurdish fighters, who broadly favour creating an autonomous Kurdish region in Syria, and Islamist Arabs, began on Tuesday after Nusra fighters attacked a Kurdish patrol and took a gunman hostage, the Observatory said.